NOTE All valve seats are replaced the same. This procedure covers one pair. REMOVAL Press valve seats (2) from cylinder head (1). CLEANING AND INSPECTION .WARNING. Skysol-100 mixture is combustible. Use mechanical ventilation whenever product is used in a confined space, is heated above ambient temperatures, or is agitated. DO NOT use or store near heat, sparks, flame, or other ignition sources. Keep container sealed when not in use. Contact with Skysol-100 may cause skin irritation. Use chemical resistant gloves. In case of skin contact, remove any contaminated clothing and wash skin thoroughly with soap and water. Wash contaminated clothing before reuse. Eye contact may cause irritation, tearing, or blurring of vision. Use face shield or goggles when eye contact may occur. In case of eye contact, flush eyes with large amounts of water for at least fifteen (15) minutes or until irritation subsides. Inhalation may cause irritation to upper respiratory passages. DO NOT have food or drink in the vicinity. 1. Clean valve seats (2) with Skysol-100 and dry with lint-free cloth. 2. Clean and polish valve seats (2) with cloth. 3. Using bevel protractor, inspect valve seats (2) for proper angle. a. Intake valve seat 29° - 31°. b. Exhaust valve seat 44° - 46°. c. If valve seat does not conform, perform valve seat grinding task. INSTALLATION NOTE Valve seats for intake and exhaust valves are different. Use the appropriate valve seat when performing installation. Press valve seats (2) on cylinder head (1). GRINDING CAUTION Ensure valve seat grinder is in alignment before work begins. Grinding valve seats with tooling out of alignment will result in damage to equipment. Grinder wheels are easily damaged. Working with damaged grinder wheels may result in damage to equipment. Inspect grinder wheels before grinding valve seats. NOTE Valves and valve seats that are correctly machined do not require the use of a lapping compound to make an air tight seal. 1. Grind valve seat (2) to proper angle (cleaning and inspection task, step 3). 2. Perform cleaning and inspection task. 3. Install valves (WP 0355 00). 0358 00-2 TM 9-2320-386-24-1-2 0358 00 VALVE SEAT MAINTENANCE (Contd)